Synthesis of Mesoporous TiO<sub>2</sub> with a Template Free One Step Reaction of Acid-Catalyzed TiC

  • Eakkarat Buapan Chulalongkorn University
  • Ekrachan Chaichana Nakhon Pathom Rajabhat University
  • Nithinart Chitpong Rajamangala University of Technology Thanyaburi
  • Bunjerd Jongsomjit Chulalongkorn University

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Abstract

Mesoporoustitania (TiO2) having high specific surface areas of 163 to 306 m2/g was prepared by a template-free one step reaction between TiC precursor and aqueous nitric acid (HNO3) solution. The effects of reaction parameters including acid concentration, reaction time and temperature were investigated. The properties of the prepared TiO2 induced by those parameters were characterized by various techniques such as thermal gravimetric/differential thermal analysis (TG/DTA) and X-ray diffraction (XRD). It was found that the TiC was completely oxidized to TiO2 at reaction time of 8 h, 70°C with 5 M HNO3. At this condition, the obtained TiO2 composed a mixed phase of 45% anatase and 55% rutile and showed the highest pore volume of 0.239 cm3/g with specific surface area of 306 m2/g. Moreover, all the anatase was transformed into the rutile when the reaction time reached 48 h. The rates of the rutile transformation increased with increasing the acid concentrations but decreased with increasing the reaction temperatures. The pore volumes and the specific surface areas were reduced by increasing the acid concentrations or the reaction temperatures. It is possibly because at the conditions of the high acid concentrations or the high temperatures, the mesoporous framework of TiO2 was collapsed. Based on the acid conditions, a peptization process was adopted to describe the effects of all investigated parameters.

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Author Biographies
Eakkarat Buapan

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Ekrachan Chaichana

Reasearch Center of Natural Materials and Products, Chemistry Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, NakhonPathom 73000, Thailand

Nithinart Chitpong

Department of Textile Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Pathumthani 12110, Thailand

Bunjerd Jongsomjit

Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Published
Vol 22 No 3, Jun 28, 2018
How to Cite
E. Buapan, E. Chaichana, N. Chitpong, and B. Jongsomjit, “Synthesis of Mesoporous TiO<sub>2</sub&gt; with a Template Free One Step Reaction of Acid-Catalyzed TiC”, Eng. J., vol. 22, no. 3, pp. 11-24, Jun. 2018.

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